Compensation of Interpolation Error for Look-Up Table-Based PMSM Control Method in Maximum Power Control

Do-Yun Kim and Jung-Hyo Lee
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Do-Yun Kim: Inverter Department, LG Magna e-Powertrain, 322, Gyeongmyeong-daero, Seo-gu, Incheon 22744, Korea
Jung-Hyo Lee: Department of Electrical Engineering, College of Engineering, Kunsan National University, Gunsan 54150, Korea

Energies, 2021, vol. 14, issue 17, 1-16

Abstract: This paper proposes a compensation method for interpolation error of the maximum power control of a PMSM control system that generates current commands through a look-up table. A torque control system using a look-up table created through experiments has superior characteristics, such as control stability and torque accuracy, compared to a system that executes torque control via a linear controller based on modeling. However, it is impossible to generate information on all the currents for the output torque in the table. Therefore, because the data stored in the look-up table have a discrete characteristic, they are linearly interpolated to generate a current command for the torque command. However, the PMSM current trajectory is generally elliptical, which causes an error owing to linear interpolation, reducing the maximum output power. In particular, when the table data are insufficient, such as in the high-speed operation range, the reduced maximum output cannot be ignored. This paper proposes a compensation method for the interpolation error using two feedforward compensators and a PI controller, which was verified through experiments.

Keywords: 2D-Interpolation; look-up table PMSM drive; interpolation error compensation; feedforward control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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